{"id":33916,"date":"2023-11-27T14:59:10","date_gmt":"2023-11-27T06:59:10","guid":{"rendered":"https:\/\/www.physics.nus.edu.sg\/?page_id=33916"},"modified":"2023-11-28T09:46:21","modified_gmt":"2023-11-28T01:46:21","slug":"colloquium-2023-dec-zhang-yang","status":"publish","type":"page","link":"https:\/\/www.physics.nus.edu.sg\/colloquium-2023-dec-zhang-yang\/","title":{"rendered":"colloquium-2023-dec-zhang-yang"},"content":{"rendered":"\t\t
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COLLOQUIUM 2023<\/h1>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Designing correlated and topological states in semiconductor moir\u00e9<\/h2>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Speaker<\/td>Yang Zhang, University of Tennessee, Knoxville <\/td><\/tr>
Date\/Time<\/td>Thursday, 21 December, 3pm<\/td><\/tr>
Location<\/td>Conference room: S11-02-07<\/span><\/td><\/tr>
Host<\/td>Prof Gong Jiangbin<\/span><\/td><\/tr><\/tbody><\/table><\/div>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Abstract<\/h4>

Transition metal dichalcogenide (TMD) based moir\u00e9 materials have been shown to host various correlated electronic phenomena including Mott insulating states and fractional filling charge orders, quantum spin Hall effects, and (fractional) quantum anomalous Hall. To describe the low-energy states of long-wavelength moir\u00e9 superlattice, we introduced the concept of moir\u00e9 quantum chemistry, and developed transfer learning based large-scale first principle methods. In twisted bilayer TMD, we proposed the Mott ferroelectricity, kinetic magnetism and pseudogap metal from spin polarons. The pseudogap metal phase emerges at small doping below half filling and an intermediate range of fields, which exhibits a single-particle gap and a doping-dependent magnetization plateau.<\/p>

I will also discuss the fractional quantum anomalous Hall effect in twisted homobilayer and its competing states. This series of works reveal the rich physics of semiconductor moir\u00e9 superlattices as manifested in a variety of correlated and topological states. <\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Biography<\/h4>

Dr Yang Zhang is an assistant professor in physics at the University of Tennessee, Knoxville, and visiting professor at Max Planck Institute Dresden. He received his BE degree from Tsinghua University and Ph.D. in Physics from Max Planck Institute Dresden, then he worked as a postdoc at MIT. His research interest lies in understanding the correlated\/topological states, quantum transport, and light-matter interaction in quantum materials. Yang has received several awards, including two overall Winner Awards in the World Supercomputing Contest, the Tschirnhaus Medal from the Leibniz Association, and the Otto-Hahn Medal of the Max Planck Society.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

COLLOQUIUM 2023 Designing correlated and topological states in semiconductor moir\u00e9 Speaker Yang Zhang, University of Tennessee, Knoxville Date\/Time Thursday, 21…<\/p>\n","protected":false},"author":77,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-33916","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.physics.nus.edu.sg\/wp-json\/wp\/v2\/pages\/33916"}],"collection":[{"href":"https:\/\/www.physics.nus.edu.sg\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.physics.nus.edu.sg\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.physics.nus.edu.sg\/wp-json\/wp\/v2\/users\/77"}],"replies":[{"embeddable":true,"href":"https:\/\/www.physics.nus.edu.sg\/wp-json\/wp\/v2\/comments?post=33916"}],"version-history":[{"count":10,"href":"https:\/\/www.physics.nus.edu.sg\/wp-json\/wp\/v2\/pages\/33916\/revisions"}],"predecessor-version":[{"id":33938,"href":"https:\/\/www.physics.nus.edu.sg\/wp-json\/wp\/v2\/pages\/33916\/revisions\/33938"}],"wp:attachment":[{"href":"https:\/\/www.physics.nus.edu.sg\/wp-json\/wp\/v2\/media?parent=33916"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}